I finally managed to:
1) Add a multi text question
2) Hide this question in javascript
3) Move each input.text of this question in answer part of the array
4) Copy the value from each sub-question row to the the relative input text
5) Hide the input text boxes from my pre-defined sub questions (1-10)
6) Automatically tick option from a hidden multiple-options question according to the given answers

The question at first appears to work, but I have some worries. This question is very crucial as will hold the data for future questions, therefore it is important that the values of text input boxes are captured correctly so that can be used in later questions.

At the moment, next questions show the original sub-question values entered from within Limesurvey Admin and not the modified ones from the text-input boxes. What do you think would be the best solution to properly link the values from the text-input boxes with the array and the hidden multiple-options question?

Below is my code together with some documentation for some commands implemented by me. It needs a lot of optimisation I know, but I'll leave that for after I manage to make it work as expected.